CN103805904A - Austenitic hot work die steel - Google Patents
Austenitic hot work die steel Download PDFInfo
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- CN103805904A CN103805904A CN201210436182.8A CN201210436182A CN103805904A CN 103805904 A CN103805904 A CN 103805904A CN 201210436182 A CN201210436182 A CN 201210436182A CN 103805904 A CN103805904 A CN 103805904A
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Abstract
The invention discloses an austenitic hot work die steel. The die steel comprises, by weight, 0.3 to 0.7% of C, 0.5 to 1.1% of Si, 7.0 to 8.0% of Mn, 6.5 to 7.5% of Cr, 3.5 to 4.5% of Ni, 0.6 to 0.8% of Mo, 0.5 to 2% of V, 0.1 to 0.2% of Zr, less than 0.02% of P, less than 0.005% of S, 0.15 to 0.30% of N, and the balance of Fe.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, relate in particular to a kind of Austenitic Hot Work Die Steel.
Background technology
Tradition hot-work die steel is martensite steel sections, though these materials have high rigidity and wear resisting property, has some critical defects, and its use temperature all below 650 ℃, cannot be worked mostly under hot conditions.In the time that temperature exceedes 650 ℃, martensitic matrix decomposes, and occurs to reply to soften, and causes material failure.Compare with this some deficiency of martensite steel sections, though austenite hot work die steel under normal temperature or hot operation condition, matrix remains single austenitic state, can avoid matrix to decompose, reply softening problem.Austenite, as matrix, has excellent toughness, but lower hardness.Generally, by adding alloying elements such as Cr, Mo, V, make it in heat treatment process, form stable, tiny carbide, rely on disperse educt strengthening matrix, the raising hardness of these carbide.In the time working under hot conditions, austenitic steel still can rely on carbide to keep self intensity and hardness.
CN101942606A discloses a kind of nitrogen alloyed austenitic hot work die steel and preparation method thereof, it has following composition and weight percent: C 0.3～0.7%, Si0.5～1.1%, Mn 10.0～15.0%, Cr 2.0～6.0%, Mo 1.5～3.5%, V 0.5～2.0%, P < 0.02%, S < 0.005%, N 0.15～0.30%, Fe surplus.Although it improves to some extent compared to existing technology, it has too focused on the effect of N, its lower hardness, and the obdurability particularly obdurability of high temperature is not very good.Therefore, still leave some room for improvement.
Summary of the invention
The object of the invention is to propose a kind of Austenitic Hot Work Die Steel, this die steel hardness ratio prior art is high, and obdurability is good.
For reaching this object, the present invention by the following technical solutions:
A kind of Austenitic Hot Work Die Steel, this die steel is made up of following component by weight percentage: C0.3～0.7%, Si0.5～1.1%, Mn 7.0～8.0%, Cr 6.5～7.5%, Ni3.5～4.5%, Mo 0.6～0.8%, V 0.5～2.0%, Zr 0.1～0.2%, P < 0.02%, S < 0.005%, N 0.15～0.30%, Fe surplus.
Preferably, this die steel is made up of following component by weight percentage: C 0.4～0.6%, Si0.7～0.9%, Mn 7.3～7.7%, Cr 6.8～7.2%, Ni 3.8～4.2%, Mo 0.65～0.75%, V 0.8～1.7%, Zr 0.13～0.17%, P < 0.02%, S < 0.005%, N 0.20～0.25%, Fe surplus.
Most preferably, this die steel is made up of following component by weight percentage: C 0.5%, Si0.8%, Mn 7.5%, Cr 7.0%, Ni 4.0%, Mo 0.70%, V 1.3%, Zr 0.15%, P < 0.02%, S < 0.005%, N 0.22%, Fe surplus.
The present invention improves prior art, adjusts the content of Mn, Cr, Mo, and adds stable austenite phase and improve the Ni element of obdurability, and adds appropriate Zr element, thereby improves the performance of hot-work die steel.Be specially:
In steel of the present invention, add N element, object have following some: 1. stable austenite tissue: nitrogen-atoms occupies face centered cubic octahedral site, can provide comparatively large vol.The distortion that on this position, gap causes does not change cubic symmetry.Nitrogen-atoms radius ratio carbon atom is little, but nitrogen is large in face-centered cube lattice dilatation compared with carbon of iron, and metallic character is strong.The expansion of lattice has improved austenitic intensity, and therefore nitrogen can slow down centroid structure to body-centered and the martensitic transformation of close-packed hexagonal structure.2. the effect of nitrogen to toughness: the appearance of nitrogen in matrix, provide more unbound electron to matrix, the substitutional element on lattice would rather form nitrogenous compound, is also reluctant it to repel to crystal boundary, and therefore the weak grain boundary segregation of nitrogen is favourable to toughness; In addition, adding of nitrogen also can reduce the spread coefficient of chromium in austenite, makes the diffusion of chromium slack-off, thereby reduces separating out of grain boundary carbide, improves toughness of material.3. the effect of nitrogen to hardness: be present in the nitrogen element in austenitic steel with solid solution form, make steel there is good performance by secondary hardening favourable during follow-up ageing treatment, in the time having the element of stable alloy, such as Ti, V or Nb, form tiny stable carbonitride disperse educt strengthening is provided, improve the strong hardness of material.4. the effect of nitrogen on thermostability: nitrogen has remarkably influenced to the thermodynamic stability of material, according to the difference of chemical composition, thermal treatment temp and aging time, can in nitrogenous steel, find dissimilar, big or small carbonitride, nitrogen can make the aging time of the Precipitation of carbonitride become longer, thereby postpones the forming core of precipitated phase.Nitrogen in carbonitride can reduce the mismatch of precipitated phase and austenitic matrix, thereby reduction interfacial energy, suppresses the alligatoring of precipitated phase, and nitrogen also can reduce the diffusibility of carbon atom and carbide forming element, postpone the overaging of carbide, improve the high-temperature stability of material.
In steel of the present invention, Mn and Ni coordinate the effect of playing stable austenite tissue, and the N element of 0.15～0.30% content plays solution strengthening effect, and after timeliness, are combined with V and form secondary precipitation and play mutually precipitation strength effect, the obdurability of raising steel of the present invention.Add appropriate Zr element and appropriate Mo element and can improve the high-temperature behavior of die steel.
The present invention has following beneficial effect:
Hot-work die steel of the present invention has good mechanical property: hardness after timeliness: HRC49-51, impelling strength: laterally sample along forging: room temperature ballistic work 135-145J; Longitudinally sample along forging: room temperature ballistic work is greater than 270J.Hot-work die steel of the present invention thermal stability under 700 ℃ of conditions is good, the stable HRC48-19 that remains on of hardness.
Embodiment
Embodiment mono-
A kind of Austenitic Hot Work Die Steel, this die steel is made up of following component by weight percentage: C 0.3%, Si1.1%, Mn7.0%, Cr 7.5%, Ni3.5%, Mo 0.8%, V 0.5%, Zr 0.2%, P < 0.02%, S < 0.005%, N 0.15%, Fe surplus.
Embodiment bis-
A kind of Austenitic Hot Work Die Steel, this die steel is made up of following component by weight percentage: C 0.7%, Si 0.5%, Mn 8.0%, Cr 6.5%, Ni 4.5%, Mo 0.6%, V 2.0%, Zr 0.1%, P < 0.02%, S < 0.005%, N 0.30%, Fe surplus.
Embodiment tri-
A kind of Austenitic Hot Work Die Steel, this die steel is made up of following component by weight percentage: C 0.4%, Si 0.9%, Mn 7.3%, Cr 7.2%, Ni 3.8%, Mo 0.75%, V 0.8%, Zr 0.17%, P < 0.02%, S < 0.005%, N 0.20%, Fe surplus.
Embodiment tetra-
A kind of Austenitic Hot Work Die Steel, this die steel is made up of following component by weight percentage: C 0.6%, Si 0.7%, Mn 7.7%, Cr 6.8%, Ni 4.2%, Mo 0.65%, V 1.7%, Zr 0.13%, P < 0.02%, S < 0.005%, N 0.25%, Fe surplus.
Embodiment five
A kind of Austenitic Hot Work Die Steel, this die steel is made up of following component by weight percentage: C 0.5%, Si 0.8%, Mn 7.5%, Cr 7.0%, Ni 4.0%, Mo 0.70%, V 1.3%, Zr 0.15%, P < 0.02%, S < 0.005%, N 0.22%, Fe surplus.
Claims (3)
1. an Austenitic Hot Work Die Steel, is characterized in that, this die steel is made up of following component by weight percentage: C 0.3～0.7%, Si0.5～1.1%, Mn 7.0～8.0%, Cr 6.5～7.5%, Ni3.5～4.5%, Mo 0.6～0.8%, V 0.5～2.0%, Zr 0.1～0.2%, P < 0.02%, S < 0.005%, N 0.15～0.30%, Fe surplus.
2. a kind of Austenitic Hot Work Die Steel as claimed in claim 1, is characterized in that, this die steel is made up of following component by weight percentage: C 0.4～0.6%, Si0.7～0.9%, Mn 7.3～7.7%, Cr 6.8～7.2%, Ni 3.8～4.2%, Mo 0.65～0.75%, V 0.8～1.7%, Zr 0.13～0.17%, P < 0.02%, S < 0.005%, N 0.20～0.25%, Fe surplus.
3. a kind of Austenitic Hot Work Die Steel as claimed in claim 2, is characterized in that, this die steel is made up of following component by weight percentage: C 0.5%, Si0.8%, Mn 7.5%, Cr 7.0%, Ni4.0%, Mo 0.70%, V 1.3%, Zr 0.15%, P < 0.02%, S < 0.005%, N 0.22%, Fe surplus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210436182.8A CN103805904A (en) | 2012-11-03 | 2012-11-03 | Austenitic hot work die steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210436182.8A CN103805904A (en) | 2012-11-03 | 2012-11-03 | Austenitic hot work die steel |
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| CN103805904A true CN103805904A (en) | 2014-05-21 |
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| CN201210436182.8A Pending CN103805904A (en) | 2012-11-03 | 2012-11-03 | Austenitic hot work die steel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110578103A (en) * | 2019-07-05 | 2019-12-17 | 天津钢研海德科技有限公司 | Novel plastic die steel with high toughness, high polishing and high corrosion resistance and manufacturing method thereof |
| CN110724873A (en) * | 2018-07-17 | 2020-01-24 | 宝钢特钢有限公司 | High-wear-resistance die forging die steel and manufacturing method thereof |
| CN112301283A (en) * | 2020-10-30 | 2021-02-02 | 上海材料研究所 | Precipitation hardening austenitic alloy steel with high expansibility and thermal stability and method for manufacturing same |
-
2012
- 2012-11-03 CN CN201210436182.8A patent/CN103805904A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110724873A (en) * | 2018-07-17 | 2020-01-24 | 宝钢特钢有限公司 | High-wear-resistance die forging die steel and manufacturing method thereof |
| CN110578103A (en) * | 2019-07-05 | 2019-12-17 | 天津钢研海德科技有限公司 | Novel plastic die steel with high toughness, high polishing and high corrosion resistance and manufacturing method thereof |
| CN110578103B (en) * | 2019-07-05 | 2021-04-30 | 天津钢研海德科技有限公司 | High-toughness, high-polishing and high-corrosion-resistance plastic die steel and manufacturing method thereof |
| CN112301283A (en) * | 2020-10-30 | 2021-02-02 | 上海材料研究所 | Precipitation hardening austenitic alloy steel with high expansibility and thermal stability and method for manufacturing same |
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Application publication date: 20140521 |